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Type: Artigo de periódico
Title: On the hydrothermal stability of CuAPSO-34 microporous catalysts for N2O decomposition: a comparison with CuZSM-5
Author: Palella, BI
Cadoni, M
Frache, A
Pastore, HO
Pirone, R
Russo, G
Coluccia, S
Marchese, L
Abstract: The hydrothermal stability of CuAPSO-34 microporous silicoaluminophosphates with chabasite structures has been investigated and compared to that of a copper-exchanged ZSM-5 zeolite by a combined XRD, FTIR, and catalytic study. CuAPSO-34 showed a higher hydrothermal structural stability (steaming 80 h at 600 degreesC), as found by XRD. Spectroscopic FTIR investigation of adsorbed CO revealed that upon this steaming procedure the concentration of monovalent copper ions in CuAPSO-34 was not significantly affected, whereas, even after a less severe steaming (60 h at 550 degreesC), these species dramatically decreased in CuZSM-5, and extraframework Al3+ ions were simultaneously formed. Consequently, the high activity in N2O decomposition shown by fresh CuZSM-5 was essentially lost after steaming, while CuAPSO-34 exhibited a significantly milder deactivation. (C) 2003 Elsevier Science (USA). All rights reserved.
Subject: N2O decomposition
hydrothermal stability
steam ageing
CO adsorption
Country: EUA
Editor: Academic Press Inc Elsevier Science
Citation: Journal Of Catalysis. Academic Press Inc Elsevier Science, v. 217, n. 1, n. 100, n. 106, 2003.
Rights: fechado
Identifier DOI: 10.1016/S0021-9517(03)00033-2
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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